日期格式化

>>> from datetime import *

>>> datetime.now().strftime("%Y-%m-%d %H:%M:%S")
'2017-08-11 17:02:08'

>>> dt = (2017, 7, 13, 0, 0, 11)

>>> datetime(*dt).strftime("%Y-%m-%d %H:%M:%S")
'2017-07-13 00:00:11'

或

>>> dt = [2017, 7, 13, 0, 0, 11]

>>> datetime(*dt).strftime("%Y-%m-%d %H:%M:%S")
'2017-07-13 00:00:11'